Plane Seal Backup Ring Structure to Prevent Seal Protrusion
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Solution Overview
Problem
Conventional sealing structures in high-pressure applications, such as pressure vessels and high-pressure tanks, face challenges in preventing seal members from protruding when pressurized, and in enhancing pressure resistance.
Innovation Solution
A sealing structure featuring a plane seal with a rubber-like elastic seal member on the high-pressure side and a resin backup ring on the low-pressure side, where the backup ring has a notch extending parallel to its thickness direction and intersecting its radial direction, and is disposed in an annular groove with a tapered surface on the low-pressure side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the seal member is pressurized from the high-pressure side, then the seal member provides sealing force, but the seal member may protrude into the gap between the two members
Solution Approach 1:
The backup ring serves as an intermediary element positioned between the seal member and the member, absorbing the protruding force generated by pressurization and preventing the seal member from entering the gap while maintaining sealing force
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed sealing structure effectively prevents the seal member from protruding under pressure and enhances pressure resistance by ensuring the backup ring absorbs pressure and maintains contact with the seal member.
Implementation Method 1
a seal member (31) made of a rubber-like elastic body
Implementation Method 2
a backup ring (32) made of a resin and mounted adjacent to the seal member (31) on a low-pressure side L of the seal member (31)... the backup ring (32) absorbs pressure
Data Source
AI summary
A sealing structure has a sealing device which is a plane seal disposed in an annular groove provided in one of two members and which seals the annular gap between the two members. The sealing device includes a seal member made of a rubber-shaped elastic body and disposed on a high-pressure side and a backup ring made of a resin mounted adjacent to the seal member on a low-pressure side of the seal member. The backup ring has a ring-like shape with ends in which a notch is formed in a part thereof, and the notch extends parallel to the thickness direction of the backup ring, and extends so as to intersect the radial direction of the backup ring. The seal member and the backup ring are disposed between the two members in a state of being pressurized from the two members, respectively.